/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.runtime.checkpoint;

/** Various reasons why a checkpoint was failure. */
public enum CheckpointFailureReason {
    PERIODIC_SCHEDULER_SHUTDOWN(true, "Periodic checkpoint scheduler is shut down."),

    TOO_MANY_CONCURRENT_CHECKPOINTS(
            true, "The maximum number of concurrent checkpoints is exceeded"),

    TOO_MANY_CHECKPOINT_REQUESTS(true, "The maximum number of queued checkpoint requests exceeded"),

    MINIMUM_TIME_BETWEEN_CHECKPOINTS(
            true,
            "The minimum time between checkpoints is still pending. "
                    + "Checkpoint will be triggered after the minimum time."),

    NOT_ALL_REQUIRED_TASKS_RUNNING(true, "Not all required tasks are currently running."),

    IO_EXCEPTION(
            true, "An Exception occurred while triggering the checkpoint. IO-problem detected."),

    CHECKPOINT_ASYNC_EXCEPTION(false, "Asynchronous task checkpoint failed."),

    CHECKPOINT_EXPIRED(false, "Checkpoint expired before completing."),

    CHECKPOINT_SUBSUMED(false, "Checkpoint has been subsumed."),

    CHECKPOINT_DECLINED(false, "Checkpoint was declined."),

    CHECKPOINT_DECLINED_TASK_NOT_READY(false, "Checkpoint was declined (tasks not ready)"),

    CHECKPOINT_DECLINED_TASK_CLOSING(false, "Checkpoint was declined (task is closing)"),

    CHECKPOINT_DECLINED_TASK_NOT_CHECKPOINTING(false, "Task does not support checkpointing"),

    CHECKPOINT_DECLINED_SUBSUMED(
            false, "Checkpoint was canceled because a barrier from newer checkpoint was received."),

    CHECKPOINT_DECLINED_ON_CANCELLATION_BARRIER(
            false, "Task received cancellation from one of its inputs"),

    CHECKPOINT_DECLINED_ALIGNMENT_LIMIT_EXCEEDED(
            false,
            "The checkpoint alignment phase needed to buffer more than the configured maximum bytes"),

    CHECKPOINT_DECLINED_INPUT_END_OF_STREAM(
            false, "Checkpoint was declined because one input stream is finished"),

    CHECKPOINT_COORDINATOR_SHUTDOWN(false, "CheckpointCoordinator shutdown."),

    CHECKPOINT_COORDINATOR_SUSPEND(false, "Checkpoint Coordinator is suspending."),

    JOB_FAILURE(false, "The job has failed."),

    JOB_FAILOVER_REGION(false, "FailoverRegion is restarting."),

    TASK_FAILURE(false, "Task has failed."),

    TASK_CHECKPOINT_FAILURE(false, "Task local checkpoint failure."),

    UNKNOWN_TASK_CHECKPOINT_NOTIFICATION_FAILURE(
            false, "Unknown task for the checkpoint to notify."),

    FINALIZE_CHECKPOINT_FAILURE(false, "Failure to finalize checkpoint."),

    TRIGGER_CHECKPOINT_FAILURE(false, "Trigger checkpoint failure.");

    // ------------------------------------------------------------------------

    private final boolean preFlight;
    private final String message;

    CheckpointFailureReason(boolean isPreFlight, String message) {
        this.preFlight = isPreFlight;
        this.message = message;
    }

    public String message() {
        return message;
    }

    /**
     * @return true if this value indicates a failure reason happening before a checkpoint is passed
     *     to a job's tasks.
     */
    public boolean isPreFlight() {
        return preFlight;
    }
}
